Have you tried a battery pull recently? That might fix what is ailing the device. It might not need a reload at all.
What other symptoms does it have? Do you have a lot of 3rd party apps, themes, ringtones, etc? Do you have data intensive apps running in the background, i.e. maps, Facebook, etc.? How much free memory do you have?
If you reload the OS, everything is wiped and the OS is replaced. You can then go in and selectively reload from the backup or load individually using DM or OTA.
As for threads, use the SEARCH feature.
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